Theoretical physics actually includes a lot of content.

For example, particle physics, quantum field theory, cosmology, and other directions all belong to the category of theoretical physics.

Of course, regardless of the direction of refinement, the biggest difference between theoretical physics and experimental physics is that the former uses mathematical methods to deduce more on paper, so as to make new discoveries.

Therefore, in the physics community, people also usually use one sentence to describe theoretical physicists and experimental physicists: theoretical physics waste paper, experimental physics costs money.

Of course, based on the characteristics of theoretical physics, it is also the most suitable for Li Mu's ability.

Hearing Li Mu's words, the academicians present were not surprised.

"Sure enough, you still chose this."

Academician Ji Zhang sighed, and then shook his head helplessly: "Okay, it seems that it has nothing to do with me, but theoretical physics is indeed quite suitable for you, of course, if you are also interested in nuclear fusion, you can also come to me." ”

Academician Le Lin also said helplessly: "It's a pity, what I do is experimental condensed matter, not theoretical condensed matter, otherwise I can still fight for it." ”

Condensed matter is also divided into two directions: theoretical and experimental, and theoretical condensed matter also belongs to theoretical physics, while experimental condensed matter is more biased towards theoretical verification and derivative application.

Other academicians also gave up.

Only Academician Yue Lang had a smile on his face.

He is the only academician who specializes in theoretical physics, especially in particle physics and quantum field theory.

He stepped forward with a smile and patted Li Mu on the shoulder: "Very good, theoretical physics is a very interesting subject, in which you can understand the ideas of many famous physicists in history, such as Einstein, Planck, and Schrödinger. ”

"When you're studying theoretical physics, you have the feeling of having a conversation with these physicists across time and space."

"Of course, the most important thing is the mathematical requirements for it."

"Your mathematical prowess is unquestionable, and I'm sure you'll be able to thrive in it."

Li Mu nodded and said with a smile: "I'm already looking forward to it." ”

"Hahaha! Good! ”

岳琅笑了起来。

Then he turned his head to look at the other academicians, and said with a smile: "Brothers, then I will concede." ”

"Lucky old thing."

Several other academicians shook their heads, and then congratulated Yue Lang.

As academicians of the same academy, the relationship between them is naturally good, so they don't have so many pounds to worry about.

At most, it's just a pity that I lost a very good student.

After determining the mentor, Li Mu went to his office with Academician Yue Lang.

His office and lab are right next to each other, and there are a bunch of graduate students doing research inside.

When these students saw the big boss coming, they all shouted respectfully: "Hello Academician Yue!" ”

It is not like Chen Shanping to personally lead students, Yue Lang's laboratory belongs to the common laboratory arrangement method in colleges and universities, basically by a small tutor to lead graduate students, as for himself because he is usually busy, he rarely has time to care about these graduate students, not to mention that his own topics are not something that ordinary students can study.

So these graduate students also rarely meet a big boss.

And Yue Lang was in a good mood today, and responded to the students' greetings with a smile, and then said, "Come, introduce you to a new junior brother, Li Mu." ”

Li Mu also walked out from behind Yue Lang and waved his hand to everyone in the laboratory, "Hello everyone." ”

Then, the graduate students present were stunned.

What?

This is ......

Li Li Li ...... Li Mu?!

Oh my God, Li Mu actually became their fellow disciple?

Their big boss actually kidnapped Li Mudu!

As for what Yue Lang said about the junior brother or something......

Just kidding, who dares to treat Li Mu as a junior brother?

This kind of big guy......

Regardless of whether they themselves are PhDs or masters, they can only express worship.

Of course, Yue Lang didn't talk nonsense, so he directly led Li Mu into his office.

“咱们就不用说别的废话了，相信你也不喜欢那些鸡毛蒜皮的事情。”

"Let's talk about academic things."

"I've read all the physics-related papers you wrote before, and they are all very good on the whole, and they all meet the graduation requirements of those ordinary students at the level."

"Of course, it is also considering that you have been so prominent before, so my graduation requirements for you will be increased accordingly."

"I don't require your dissertation to be submitted to top journals such as Nature, Science, or PRL, but it must be like your "Electrodynamic Analysis of the Electrodynamic Behavior of Two Types of Conductor Interfaces", which can have a certain impact on the entire academic community."

"You've done it once, and I'm confident you can do it again."

"Normally, I don't interfere with your research, you can do whatever you want, and of course you can work on projects with me."

“就目前来说，如果你对研究方向还没什么想法的话，我也建议你先来我这边。”

"Although there is some overlap between the problems you have studied before and the cutting-edge research fields of theoretical physics, there is not much overlap, such as particle physics and quantum field theory."

"My current project is closely related to these two aspects, and it will also help you figure out what to study faster."

"It's up to you."

"If you need funding, you can tell me, and I can provide you with a certain amount of funding every year according to the project you want to do."

"That's pretty much all for you to say, it's up to you."

岳琅说完，端起旁边的茶杯喝了一口，等待着李牧作出决定。

For a genius like Li Mu, Yue Lang was very clear in terms of cultivation methods, and he couldn't force him to do anything.

Otherwise, it will only affect the development of their talents.

Li Mu thought for a moment, and then asked, "Academician Yue, what are the projects you are working on now?" ”

Yue Lang smiled, then directly pulled a document from the side and handed it to Li Mu.

"This is it."

Li Mu took this information and saw that it was written: [Verification of the existence of Zcs containing strange quark hidden four quark states].

"Any idea what this is?"

Yue Lang asked with a smile, obviously thinking of the test.

But for Li Mu's knowledge reserve, this is very simple.

"According to the Standard Model of particle physics, in addition to the 'traditional' hadron, which is a meson made up of two quarks, or a baryon made up of three quarks, there may be 'exotic' hadrons composed of four quarks or five quarks, as well as pure gluons."

"So this Zcs should belong to one of them."

"Finding a new particle?"

Li Mu raised his head and looked at Yue Lang.

Yue Lang laughed, and then nodded slightly: "That's very good, that's it." ”

"Theoretical physics is inseparable from quantum theory, and quantum theory is inseparable from these elementary particles."

"Therefore, the discovery of new particles has become the hot topic that we are most committed to studying in theoretical physics."

"Of course, from a utilitarian point of view, as long as such a new particle is discovered, you can casually publish a natural, scientific or something."

"But in our academic world, it's better to be utilitarian."

Yue Lang smiled and continued: "This four-quark particle is also one of them, and the purpose now is to analyze the possibility of its existence from various experimental data, so what is especially needed is a mathematical master like you. ”

Li Mu nodded, and then couldn't help but ask curiously, "Then where does our experimental data come from?" It's impossible for us to have this kind of particle collider at Shanghai Jiaotong University, right? ”

Yue Lang waved his hand helplessly: "Of course this is impossible, if there is, I can wake up laughing in my dreams." ”

"Our project is based on the Shangjing Institute of High Energy Physics, and the analysis is based on the experimental data of the Shangjing Spectrometer III."

Li Mu nodded, expressing understanding.

The Shangjing Spectrometer III is a large-scale general-purpose magnetic spectrometer on the Shangjing Positron Collider, which is mainly used to monitor and record the relevant data generated during particle collisions.

Particle physicists in theoretical physics obviously cannot directly observe what happens when particles collide.

There is no device that can help scientists directly observe this microscopic phenomenon.

Therefore, the most basic research method is to process the data recorded by the device according to various data, such as the energy of the particles, trajectories, etc., and then use mathematical methods to process these data, and finally analyze the results from them.

"How? Would you like to come and work on this project with me? ”

Li Mu pondered for a moment, and then said, "Since you have suggested so, then I'll give it a try first." ”

"Okay."

Yue Lang bowed, and then brought another pile of information from the side.

"The information in this is all relevant data, and it contains the results of hundreds of thousands of collisions, and I guess that if I can find it, I should be able to find it from this data."

"You can take a look first, and ask me if you don't understand anything."

Li Mu took over these materials, and the different types of materials in them have also been separated by clips.

"This stack is the time-of-flight statistics, and the time-of-flight of charged particles is measured in it; This is the statistical result of the cluster counter, which records the energy of various particles. ”

"And then there's the ...... of beam brightness that records the position."

Yue Lang taught Li Mu to understand these data hand in hand, and also told him the role of these data.

After all, it was the first time for Li Mu to get this kind of information, and of course he had to introduce Li Mu to the door first.

Soon, Li Mu initially grasped the meaning of these data and how they came about.

It's just that after looking at it carefully for a while, his brow can't help but wrinkle.

"How do you feel about the data in this...... A bit miscellaneous? There are quite a few data that exceed the margin of error by several times. ”

岳琅笑了笑，脸上也有些无奈：“没办法，咱们国内的粒子对撞机就是这样，在先进程度上和国外最顶级的对撞机还有一定的差距，在统计数据的时候，总是会受到各种各样的噪音干扰。 ”

"You should also be able to imagine that in the process of this kind of experiment, noise is always unavoidable, even if it is the earth's magnetic field, gravity, coupled with ubiquitous electromagnetic interference, etc., will affect the accuracy of the measurement, so why we who study high-energy physics dream of building a collider on the moon is because it can greatly get rid of this effect."

"Okay."

Li Mu had no choice but to accept such a reality.

I also have to sigh.

Even if the study is theoretical physics, it still has to rely on experiments.

Just like Yang Zhenning and Tsung-Dao Lee, after proposing the law of non-conservation of universal symmetry, the physics community could not believe it, because it overturned the law of conservation of universal symmetry that the physics community has always adhered to, so their paper was not recognized at the beginning.

It was not until later, under the elaborate experiments of another physicist, Wu Chien-shiung, that the law of non-conservation of universal symmetry was verified, and they were awarded the Nobel Prize in Physics.

In this way, experimental physics and theoretical physics complement each other and coexist closely.

Next, Li Mu continued to watch, and Yue Lang rarely didn't get busy with his own affairs, waiting quietly beside him, occasionally going to the laboratory to ask how his students were doing.

Time passed quickly, and from noon to afternoon, Li Mu stayed in Yue Lang's office, looking at the data.

It wasn't until lunch arrived that Yue Lang returned to the office from the laboratory again, and when he saw Li Mu's serious appearance, his eyes were also relieved and emotional.

Being able to look at these boring data for so long, it is no wonder that Li Mu can make such great achievements.

随后，他便对李牧招呼了一声：“好了，咱们先去吃饭吧，不用太辛苦了。 ”

But Li Mu said at this time: "You go eat first, I have some thoughts about these data now." ”

"Huh? What's the idea? ”岳琅顿时就是一愣。

Although it was indeed quite a long time to watch it for an afternoon, what can you think of this?

Li Mu took the paper and pen from the side: "Reduce noise for these data." ”

Yue Lang: "??? ”

The use of mathematical methods to denoise experimental data is indeed a common method, and it has always been the direction that major particle collider researchers have tried.

However, unlike Li Mu's noise reduction method, their noise reduction algorithm is generally determined, and then written into the computer monitoring and statistical equipment, and then in the process of collecting data from these devices, the noise reduction is directly completed, which can also ensure that the real data in the particle collision process will not be affected.

Li Mu's direct starting from the experimental data that has been obtained is likely to affect the real data, and in the end, not only will not achieve noise reduction, but even affect the authenticity of the data.

This can no longer be called noise reduction, but "repair".

It's like restoring those movies with lower quality in the last century and making them higher, which is very troublesome, and one carelessness may lead to the distortion of the original picture.

What's more, how long has Li Mu only watched it, can he really do it?

Yue Lang's heart couldn't help but give birth to such a question.

However, since Li Mu dared to do this, it showed that he was already sure.

In fact, since he got this data, his mental computer has been thinking about it.

And with the help of the computer in his mind, it was far easier to do this than Yue Lang imagined.

In just a few moments, Li Mu completed the repair of the first collision energy data.

And this repaired data suddenly returned to the error range of one time of the confidence interval!

Yue Lang next to him was shocked.

Just by virtue of this method of noise reduction, Li Mu can be invited by various high-energy physics research units around the world!

Even......

If this method is systematically summarized and published in a paper, maybe, it will directly meet the graduation requirements he told Li Mu at noon?

Graduating on the first day of entry?

……

[I went out to do things two days ago, today may be yang, a little sluggish, today it's 8k words, continue after adding more]

(End of chapter)